Nominated in the categories, Audio, Lighting, Technical Achievement and Entertainment, the PBS program won all categories in which it was nominated.

This year’s awards bring the tally of Emmy awards it has won to nine. In 2013, Bluegrass Underground received a nod for Best Lighting, and in 2014 it came home with four awards; Best Entertainment Program, Best Director-Program, Best Audio, and Best Lighting.

Filmed 333 feet (101 meters) below the surface in the natural amphitheater of Tennessee’s Cumberland Caverns’ Volcano Room, the popular television program features America’s top bands and artists completely un-amplified thanks to the caves remarkable acoustics.